How to set Git config values?

You can set Git configuration values using the git config command. There are three levels at which you can set configuration values: local, global, and system.

Local Configuration (specific to the repository):
```
git config --local <key> <value>
```
Global Configuration (for the current user across all repositories):
```
git config --global <key> <value>
```
System Configuration (for all users on the system):
```
git config --system <key> <value>
```

Examples:

To set the user name globally:

git config --global user.name "Your Name"

To set the user email locally for a specific repository:
```
git config --local user.email "your.email@example.com"
```
To set the default text editor globally:
```
git config --global core.editor "nano"
```

You can also view all configurations using:

git config --list